Abstract: In an arrangement for measuring an electrical power or energy, for each of a plurality of phases, the arrangement includes a voltage input in a transformer supplied with current and connected to an integrator with a high ohm input. Each transformer is connected via an integrator with a high ohm input to a mark-space-amplitude modulator, one of which is provided per phase. Each voltage input is also in communication with the corresponding mark-space-amplitude modulator. Each mark-space-amplitude modulator comprises a mark-space modulator and a pulse amplitude modulator. Each pulse amplitude modulator is provided with two push-pull outputs, each of which is connected to an input of a current/frequency converter for the integration of marks (pulses) and spaces (i.e. spaces between pulses) present at the output of the pulse amplitude modulator. The current/frequency converter is connected to processing and display circuitry for displaying an output.